Menstrual cup



FIG. 1 is a bottom perspective view of a menstrual cup showing the new design;

FIG. 2 is a top perspective view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is another side view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines shown in the drawings represent portions of the menstrual cup that form no part of the claimed design. 

CLAIM The ornamental design for a menstrual cup, as shown and described. 